Pen cap



FIG. 1 is an upper front right perspective view of a pen cap showing mynew design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof, with the left sideelevation view being a mirror image of the right side elevation view;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is an enlarged top plan view thereof; and,

FIG. 8 is an enlarged bottom plan view thereof.

The broken lines shown in FIGS. 6 and 8 illustrate environmental subjectmatter and form no part of the claimed design.

CLAIM The ornamental design for a pen cap, as shown and described.